单项选择题
A.6.5mm B.7.0mm C.7.5mm D.8.0mm
A.1~4mm B.3~6mm C.5~8mm D.7~9mm
A.25mm B.30mm C.35mm D.40mm
A.铸铁 B.铸钢 C.锻钢 D.铝合金
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